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A married assistant principal in Louisiana faces murder charges after the body of his missing pregnant co-worker was found in a ditch, police said.

Robert Marks worked as an assistant principal at the Brookstown Magnet Honors Academy. (Baton Rouge Police Dept.)

Robert Marks was already in jail for allegedly kidnapping the woman’s 3-year-old daughter when Baton Rouge police upgraded the charges to first degree murder and first-degree feticide in the death of 40-year-old Lyntell Washington and her unborn child, according to WAFB.

“He has no emotion. We continued to press him for more information and still no answer and still no emotion,” Baton Rouge Police Department spokesperson L’Jean McKneely told the station. “We have all the details that we need, we have all the evidence that we need, that’s why he’s being charged with those particular crimes.”

One of Marks’ co-workers told police that Washington was carrying his child and had threatened to expose their relationship to the man’s wife.

An autopsy determined Washington died from a gunshot wound to the head.

Police arrested Marks on June 9 after Washington’s 3-year-old daughter was found alone in a parking lot near her mother’s abandoned car, which had blood spattered on the interior, according to the The Advocate.

When detectives arrived, the little girl told them, “Mom’s in the lake,” according to a police report obtained by WAFB. She also told investigators that “‘Mr. Robbie’ hurt her mother and was now sleeping.”

Before his arrest, Marks worked at the Brookstown Magnet Honors Academy. Washington, who worked at the same school as an instructional specialist, was given the “Teacher of the Year” award at the Eden Park Superintendent’s Academy.